'use strict'
const path = require('path')
const defaultSettings = require('./src/settings.js')

function resolve(dir) {
  return path.join(__dirname, dir)
}

const name = defaultSettings.title || 'vue Admin Template' // page title

// If your port is set to 80,
// use administrator privileges to execute the command line.
// For example, Mac: sudo npm run
// You can change the port by the following methods:
// port = 9528 npm run dev OR npm run dev --port = 9528
// 短路运算,把9528改成自己需要的,然后重新启动项目就行
const port = process.env.port || process.env.npm_config_port || 8080 // dev port

// All configuration item explanations can be find in https://cli.vuejs.org/config/
module.exports = {
  /**
   * You will need to set publicPath if you plan to deploy your site under a sub path,
   * for example GitHub Pages. If you plan to deploy your site to https://foo.github.io/bar/,
   * then publicPath should be set to "/bar/".
   * In most cases please use '/' !!!
   * Detail: https://cli.vuejs.org/config/#publicpath
   */
  publicPath: '/',
  outputDir: 'dist',
  assetsDir: 'static',
  lintOnSave: process.env.NODE_ENV === 'development',
  productionSourceMap: false,
  // 7月8号修改------7月8号修改---------------------------------
  // 测试服务器,运行项目
  devServer: {
    // 端口
    port: port,
    // 是否自动运行项目
    open: true,
    overlay: {
      warnings: false,
      errors: true
    },
    // 7月8号修改--配置跨域----7月8号修改----配置跨域-----------------------------
    // 通过代理服务器解决跨域
    // 代理配置,注意注意注意,proxy的p必须是小写,必须是小写
    // proxy就是代理的意思  读音 prɑːksi
    proxy: {
      // /lin 可以理解为是一个特殊的标记,名字随便定义,但是要和根目录.env.development文件里面的定义的名字一样(VUE_APP_BASE_API = '/lin')
      // 然后呢.env.development配置的基地址(而这个基地址就是utile/request.js里面的 baseURL: process.env.VUE_APP_BASE_API使用了)
      // 改好后必须重新运行项目
      '/lin': {
        // 通过代理服务器请求地址
        // target就是你要把这次的请求代理到什么位置,(因为用他的目的是解决跨域,就需要告诉他,要这个这次的请求发到哪里去)
        // 比如,如果你想代理到百度https://www.baidu.com,那就填写百度的地址,如果想去谷歌，那就填写谷歌
        target: 'http://localhost:3000/api',
        // 是否跨越, 需要设置true,才可以让本地服务代理我们发出请求
        changeOrigin: true,
        pathRewrite: {
          // 如果需要把路径中的特殊标记删除,可以使用重写
          '^/lin': ''
        }
      }
    }
    // 拦截了ajax请求, 使用了模拟数据(注释掉或者删除都行)
    // before: require('./mock/mock-server.js')
  },
  configureWebpack: {
    // provide the app's title in webpack's name field, so that
    // it can be accessed in index.html to inject the correct title.
    name: name,
    resolve: {
      alias: {
        '@': resolve('src')
      }
    }
  },
  chainWebpack(config) {
    // it can improve the speed of the first screen, it is recommended to turn on preload
    config.plugin('preload').tap(() => [
      {
        rel: 'preload',
        // to ignore runtime.js
        // https://github.com/vuejs/vue-cli/blob/dev/packages/@vue/cli-service/lib/config/app.js#L171
        fileBlacklist: [/\.map$/, /hot-update\.js$/, /runtime\..*\.js$/],
        include: 'initial'
      }
    ])

    // when there are many pages, it will cause too many meaningless requests
    config.plugins.delete('prefetch')

    // set svg-sprite-loader
    config.module
      .rule('svg')
      .exclude.add(resolve('src/icons'))
      .end()
    config.module
      .rule('icons')
      .test(/\.svg$/)
      .include.add(resolve('src/icons'))
      .end()
      .use('svg-sprite-loader')
      .loader('svg-sprite-loader')
      .options({
        symbolId: 'icon-[name]'
      })
      .end()

    config.when(process.env.NODE_ENV !== 'development', config => {
      config
        .plugin('ScriptExtHtmlWebpackPlugin')
        .after('html')
        .use('script-ext-html-webpack-plugin', [
          {
            // `runtime` must same as runtimeChunk name. default is `runtime`
            inline: /runtime\..*\.js$/
          }
        ])
        .end()
      config.optimization.splitChunks({
        chunks: 'all',
        cacheGroups: {
          libs: {
            name: 'chunk-libs',
            test: /[\\/]node_modules[\\/]/,
            priority: 10,
            chunks: 'initial' // only package third parties that are initially dependent
          },
          elementUI: {
            name: 'chunk-elementUI', // split elementUI into a single package
            priority: 20, // the weight needs to be larger than libs and app or it will be packaged into libs or app
            test: /[\\/]node_modules[\\/]_?element-ui(.*)/ // in order to adapt to cnpm
          },
          commons: {
            name: 'chunk-commons',
            test: resolve('src/components'), // can customize your rules
            minChunks: 3, //  minimum common number
            priority: 5,
            reuseExistingChunk: true
          }
        }
      })
      // https:// webpack.js.org/configuration/optimization/#optimizationruntimechunk
      config.optimization.runtimeChunk('single')
    })
  }
}
